{"id":226457,"date":"2024-03-31T19:36:44","date_gmt":"2024-03-31T19:36:44","guid":{"rendered":"https:\/\/namso-gen.co\/blog\/?p=226457"},"modified":"2024-03-31T19:36:44","modified_gmt":"2024-03-31T19:36:44","slug":"how-to-compare-with-null-value-in-oracle","status":"publish","type":"post","link":"https:\/\/namso-gen.co\/blog\/how-to-compare-with-null-value-in-oracle\/","title":{"rendered":"How to compare with null value in Oracle?"},"content":{"rendered":"<p>In Oracle, comparing with null values can sometimes be a tricky task. Null represents the absence of a value, making it unique and often unpredictable in its behavior. This article will guide you through different approaches to compare null values in Oracle and provide clarity on this often confusing concept.<\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_62 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title \" >Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/namso-gen.co\/blog\/how-to-compare-with-null-value-in-oracle\/#How_to_Compare_with_Null_Value_in_Oracle\" title=\"How to Compare with Null Value in Oracle?\">How to Compare with Null Value in Oracle?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/namso-gen.co\/blog\/how-to-compare-with-null-value-in-oracle\/#1_Can_I_use_the_equality_operator_to_compare_null_values_in_Oracle\" title=\"1. Can I use the equality operator (=) to compare null values in Oracle?\">1. Can I use the equality operator (=) to compare null values in Oracle?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/namso-gen.co\/blog\/how-to-compare-with-null-value-in-oracle\/#2_How_do_I_compare_if_a_column_is_not_null_in_Oracle\" title=\"2. How do I compare if a column is not null in Oracle?\">2. How do I compare if a column is not null in Oracle?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/namso-gen.co\/blog\/how-to-compare-with-null-value-in-oracle\/#3_Can_I_use_NULL_in_a_WHERE_clause_to_match_null_records_similar_to_the_IS_NULL_operator\" title=\"3. Can I use NULL in a WHERE clause to match null records, similar to the IS NULL operator?\">3. Can I use NULL in a WHERE clause to match null records, similar to the IS NULL operator?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/namso-gen.co\/blog\/how-to-compare-with-null-value-in-oracle\/#4_What_happens_if_I_compare_a_value_with_null_using_the_operator\" title=\"4. What happens if I compare a value with null using the != operator?\">4. What happens if I compare a value with null using the != operator?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/namso-gen.co\/blog\/how-to-compare-with-null-value-in-oracle\/#5_How_can_I_compare_two_columns_both_of_which_can_be_null\" title=\"5. How can I compare two columns, both of which can be null?\">5. How can I compare two columns, both of which can be null?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/namso-gen.co\/blog\/how-to-compare-with-null-value-in-oracle\/#6_What_is_the_result_of_arithmetic_operations_involving_null_values\" title=\"6. What is the result of arithmetic operations involving null values?\">6. What is the result of arithmetic operations involving null values?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/namso-gen.co\/blog\/how-to-compare-with-null-value-in-oracle\/#7_Are_null_values_indexed_in_Oracle\" title=\"7. Are null values indexed in Oracle?\">7. Are null values indexed in Oracle?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/namso-gen.co\/blog\/how-to-compare-with-null-value-in-oracle\/#8_Can_I_use_the_CASE_statement_to_compare_with_null_values\" title=\"8. Can I use the CASE statement to compare with null values?\">8. Can I use the CASE statement to compare with null values?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/namso-gen.co\/blog\/how-to-compare-with-null-value-in-oracle\/#9_How_does_the_NVL_function_help_in_comparing_nulls\" title=\"9. How does the NVL function help in comparing nulls?\">9. How does the NVL function help in comparing nulls?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/namso-gen.co\/blog\/how-to-compare-with-null-value-in-oracle\/#10_Are_null_values_treated_differently_when_using_the_BETWEEN_operator\" title=\"10. Are null values treated differently when using the BETWEEN operator?\">10. Are null values treated differently when using the BETWEEN operator?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/namso-gen.co\/blog\/how-to-compare-with-null-value-in-oracle\/#11_Can_I_compare_a_null_value_with_an_empty_string_%E2%80%9D\" title=\"11. Can I compare a null value with an empty string (&#8221;)?\">11. Can I compare a null value with an empty string (&#8221;)?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/namso-gen.co\/blog\/how-to-compare-with-null-value-in-oracle\/#12_How_can_I_find_rows_with_null_values_in_multiple_columns_simultaneously\" title=\"12. How can I find rows with null values in multiple columns simultaneously?\">12. How can I find rows with null values in multiple columns simultaneously?<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"How_to_Compare_with_Null_Value_in_Oracle\"><\/span>How to Compare with Null Value in Oracle?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><b>In Oracle, you cannot compare null values using the standard comparison operators like =, <, or >. Instead, you should use the special equality operator IS NULL.<\/b> This operator evaluates whether a given expression or column is null or not.<\/p>\n<p>Here&#8217;s an example to illustrate its usage:<\/p>\n<p>&#8220;`sql<br \/>\nSELECT *<br \/>\nFROM employees<br \/>\nWHERE salary IS NULL;<br \/>\n&#8220;`<\/p>\n<p>In the example above, the query selects all employees whose salary is null. The IS NULL operator comes in handy when you want to filter or identify null values within your database.<\/p>\n<p>Now let&#8217;s explore some frequently asked questions related to comparing null values in Oracle:<\/p>\n<h3><span class=\"ez-toc-section\" id=\"1_Can_I_use_the_equality_operator_to_compare_null_values_in_Oracle\"><\/span>1. Can I use the equality operator (=) to compare null values in Oracle?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nNo, comparing null values using = will always yield a null result, not true or false. Hence, IS NULL is the appropriate operator to use for null comparisons.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"2_How_do_I_compare_if_a_column_is_not_null_in_Oracle\"><\/span>2. How do I compare if a column is not null in Oracle?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nTo check if a column is not null, you can use the IS NOT NULL operator. It returns true if the column holds a non-null value.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"3_Can_I_use_NULL_in_a_WHERE_clause_to_match_null_records_similar_to_the_IS_NULL_operator\"><\/span>3. Can I use NULL in a WHERE clause to match null records, similar to the IS NULL operator?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nNo, using NULL directly in a WHERE clause will not yield the desired result. You should always use IS NULL instead.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"4_What_happens_if_I_compare_a_value_with_null_using_the_operator\"><\/span>4. What happens if I compare a value with null using the != operator?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nThe != operator, also known as the inequality operator, returns unknown when comparing with null. It should not be used for null comparisons.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"5_How_can_I_compare_two_columns_both_of_which_can_be_null\"><\/span>5. How can I compare two columns, both of which can be null?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nTo compare two columns that can be null, you can use the special operator IS NOT DISTINCT FROM. This operator considers null values as equivalent during the comparison.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"6_What_is_the_result_of_arithmetic_operations_involving_null_values\"><\/span>6. What is the result of arithmetic operations involving null values?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nAny arithmetic operation involving a null value will result in null. For example, adding or subtracting null with any other value will result in null.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"7_Are_null_values_indexed_in_Oracle\"><\/span>7. Are null values indexed in Oracle?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nNull values are not indexed in Oracle&#8217;s standard B-tree indexes. However, Oracle provides a bitmap index that can handle null values efficiently.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"8_Can_I_use_the_CASE_statement_to_compare_with_null_values\"><\/span>8. Can I use the CASE statement to compare with null values?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nYes, the CASE statement can be used to handle different conditions, including null values. You can specify conditions for null values explicitly in your CASE statement.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"9_How_does_the_NVL_function_help_in_comparing_nulls\"><\/span>9. How does the NVL function help in comparing nulls?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nThe NVL function allows you to substitute a null value with another value of your choice. It can be used in comparisons to treat null values as a specific value for more accurate results.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"10_Are_null_values_treated_differently_when_using_the_BETWEEN_operator\"><\/span>10. Are null values treated differently when using the BETWEEN operator?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nNo, null values are not treated differently when using the BETWEEN operator. If a column has a null value, it will not be included in the result.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"11_Can_I_compare_a_null_value_with_an_empty_string_%E2%80%9D\"><\/span>11. Can I compare a null value with an empty string (&#8221;)?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nYes, you can compare a null value with an empty string using the appropriate operator. However, keep in mind that null values and empty strings are not equivalent in Oracle.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"12_How_can_I_find_rows_with_null_values_in_multiple_columns_simultaneously\"><\/span>12. How can I find rows with null values in multiple columns simultaneously?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nTo find rows with null values in multiple columns, you can combine multiple IS NULL conditions using the logical AND operator.<\/p>\n<p>In conclusion, comparing null values in Oracle requires special attention. Using the IS NULL and IS NOT NULL operators appropriately can help you handle null values effectively in your queries. Remember that null behaves differently from regular values, and understanding how to compare with null will assist you in accurately querying your database.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In Oracle, comparing with null values can sometimes be a tricky task. Null represents the absence of a value, making it unique and often unpredictable in its behavior. This article will guide you through different approaches to compare null values in Oracle and provide clarity on this often confusing concept. How to Compare with Null &#8230; <\/p>\n<p class=\"read-more-container\"><a title=\"How to compare with null value in Oracle?\" class=\"read-more button\" href=\"https:\/\/namso-gen.co\/blog\/how-to-compare-with-null-value-in-oracle\/#more-226457\">Read more<span class=\"screen-reader-text\">How to compare with null value in Oracle?<\/span><\/a><\/p>\n","protected":false},"author":57,"featured_media":107420,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[86279],"tags":[],"class_list":["post-226457","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-learn","no-featured-image-padding"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How to compare with null value in Oracle?<\/title>\n<meta name=\"description\" content=\"In Oracle, comparing with null values can sometimes be a tricky task. 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